The Courtesan's Book of Secrets

Uncovered: a list of noblemen's names--each one guilty of treason
To save his family legacy, Rafe Densmore must seize a courtesan's infamous register. No one can ever know how his father betrayed his country! One person stands in Rafe's way--the beautiful Cornelia, Comtesse de Vane.
In the card rooms of Paris, Rafe and Cornelia made an unbeatable...intimate team. Until, convinced of Rafe's desertion, desperate Cornelia married an elderly comte. Now, returning to London an impoverished widow, she'll do anything to possess the register.
Even if that means becoming Rafe's partner once again....